[NTG-context] Color rendering transparency with metapost
Hi,
I have some trouble using a gradient background (solid) with a
transparent element :
\startMPinclusions
def test_shade (expr a, b) =
pickup pencircle scaled 1mm ;
color ca ; ca := \MPcolor{a} ;
color cb ; cb := \MPcolor{b} ;
color cc ; cc := \MPcolor{c} ;
sh := define_linear_shade(origin
shifted(0cm,.5*\overlayheight),origin,ca,cb) ;
fill fullsquare xscaled \overlaywidth yscaled \overlayheight
withshade sh;
draw origin withcolor cc;
draw origin shifted(0cm,-.25*\overlayheight) withcolor cc;
enddef ;
\stopMPinclusions
\setupcolors[state=start]
\definecolor[a][r=.57254902,g=.784313725,b=.917647059]
\definecolor[b][white]
\definecolor[c][darkred]
\starttext
\defineoverlay[bgoverlay][\uniqueMPgraphic{bg_top_shade}]
\setupbackgrounds[page][background=bgoverlay]
\startuniqueMPgraphic{bg_top_shade}
test_shade(origin, origin shifted(0cm,1cm));
draw fullcircle scaled 10cm shifted (0cm,0.25*\overlayheight)
withcolor transparent(1,0.5,white) withpen pencircle scaled 2cm;
If you comment out the previous line the color rendering is
definitelly different...
\stopuniqueMPgraphic
\input knuth
\stoptext
I have searched the ML without success, any idea ?
Regards,
Renaud
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Re: [NTG-context] Color rendering transparency with metapost
Thank Luigi for your response, the problem is that the background color rendering isn't the same if you comment out or not the following line : draw fullcircle scaled 10cm shifted (0cm,0.25*\overlayheight) withcolor transparent(1,0.5,white) withpen pencircle scaled 2cm; After some experiments, the problem is solved ( hence not understood ???) using rgb=no in setupcolors... It's maybe a viewer-centric problem : I use acroread 8.1.2 under linux. Renaud luigi scarso a écrit : This is my test. Where is the problem ? minimals-beta Linux luigicasa-laptop 2.6.24-21-generic #1 SMP Tue Oct 21 23:43:45 UTC 2008 i686 GNU/Linux This is LuaTeX, Version snapshot-0.30.2-2008102016, build unknown ConTeXt MtxRun | current version: 2008.10.31 13:58 -- luigi ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___ ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Color rendering transparency with metapost
I must add that I have defined the a color with cmyk. Renaud Aubin a écrit : Thank Luigi for your response, the problem is that the background color rendering isn't the same if you comment out or not the following line : draw fullcircle scaled 10cm shifted (0cm,0.25*\overlayheight) withcolor transparent(1,0.5,white) withpen pencircle scaled 2cm; After some experiments, the problem is solved ( hence not understood ???) using rgb=no in setupcolors... It's maybe a viewer-centric problem : I use acroread 8.1.2 under linux. Renaud luigi scarso a écrit : This is my test. Where is the problem ? minimals-beta Linux luigicasa-laptop 2.6.24-21-generic #1 SMP Tue Oct 21 23:43:45 UTC 2008 i686 GNU/Linux This is LuaTeX, Version snapshot-0.30.2-2008102016, build unknown ConTeXt MtxRun | current version: 2008.10.31 13:58 -- luigi ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___ ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___ ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Color rendering transparency with metapost
On Sat, Nov 1, 2008 at 2:06 AM, Renaud Aubin [EMAIL PROTECTED] wrote: Thank Luigi for your response, the problem is that the background color rendering isn't the same if you comment out or not the following line : draw fullcircle scaled 10cm shifted (0cm,0.25*\overlayheight) withcolor transparent(1,0.5,white) withpen pencircle scaled 2cm; true After some experiments, the problem is solved ( hence not understood ???) using rgb=no in setupcolors... They seem differents again It's maybe a viewer-centric problem : I use acroread 8.1.2 under linux. no, I don't believe. Try to investigate with \pdfcompresslevel0 at the beginning -- luigi ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
